77040511991 has 16 divisors (see below), whose sum is σ = 88826479200. Its totient is φ = 66323755008.

The previous prime is 77040511987. The next prime is 77040512071. The reversal of 77040511991 is 19911504077.

It is a cyclic number.

It is not a de Polignac number, because 77040511991 - 2² = 77040511987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77040511901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4102970 + ... + 4121703.

It is an arithmetic number, because the mean of its divisors is an integer number (5551654950).

Almost surely, 2^77040511991 is an apocalyptic number.

77040511991 is a deficient number, since it is larger than the sum of its proper divisors (11785967209).

77040511991 is a wasteful number, since it uses less digits than its factorization.

77040511991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8224738.

The product of its (nonzero) digits is 79380, while the sum is 44.

The spelling of 77040511991 in words is "seventy-seven billion, forty million, five hundred eleven thousand, nine hundred ninety-one".